Thailand mandates hazard assessment of work environment by Nov 2025 
Ministry of Labour of Thailand published the “Notification of the Ministry of Labour regarding Hazard Assessment, Study of Workplace Environmental Impacts, and Preparation of Employee and Business Establishment Control Plans” in the Government Gazette on 22 November 2024. The notification provides guidance to implement hazard assessment and associated tasks prescribed in the Section 32 of Occupational Safety, Health and Environment Act B.E. 2554 (2011). The Notification shall come into force after 180 days from the date of its publication in the Government Gazette, namely 21 May 2025.
Target business
This notification shall apply to business establishments listed in Schedule 1 with two or more employees and business establishments listed in Schedule 2 with 20 or more employees as attached to this notification. Schedule 1 lists 5 business types (mining, petroleum exploitation, petrochemical, petroleum refinery and gas separation plant) while Schedule 2 lists 48 business establishments including manufacturing sector (food, textile, plastic, metal, electronics, machinery, automobile and etc.), recycling, hotels, hospitals and amusement parks.
Responsibilities of the employer
Employers shall conduct hazard assessments, study workplace environmental impacts, and prepare hazard assessment results, safety, occupational health and working environment action plans, and employee and business establishment control plans within one hundred and eighty days from the effective date of this notification (namely by 17 Nov 2025) or from the date when the number of employees reaches the threshold, as the case may be, and review the implementation every three years.
In cases where there are modifications or changes to machinery, equipment, work processes, changes in working environment conditions, or any operations, including changes resulting from natural disasters or for the purpose of assistance, mitigation, or other factors that affect working conditions, employers shall implement the requirements to cover the periods before, during, and after such modifications or changes. Employers shall complete this implementation without delay, within thirty days, and maintain the implementation results at the business establishment, which may be kept in electronic format, for examination by safety inspectors.
Following methods for hazard assessments can be applied to meet the requirement.
- Job Safety Analysis (JSA)
- Checklist
- What-If Analysis
- Hazard and Operability Studies (HAZOP)
- Fault-Tree Analysis (FTA)
- Event-Tree Analysis (ETA)
- Failure Modes and Effects Analysis (FMEA)
Along with the above requirements, employers shall prepare reports on hazard assessment results, impact studies, safety, occupational health and working environment action plans, and employee and business establishment control plans according to the form attached to this notification or with details no less than those specified in the appendix to this notification. These reports shall be submitted through the Department of Labour Protection and Welfare’s electronic system, in person, or by mail to the Director-General of the Department of Labour Protection and Welfare or their designee within sixty days from the completion of hazard assessment, workplace environmental impact study, preparation of safety, occupational health and working environment action plan, and employee and business establishment control plan. The documentation shall be maintained for no less than three years, which may be kept in electronic format, for examination by safety inspectors.
The original text of the Notification is available at: https://ratchakitcha.soc.go.th/documents/51411.pdf
